Jane Krakowski reminds me of Liza Minnelli in that video. I don't know whether that's good or bad.
Let's get right down to it. Laura Benanti is Courtney Cox and Jane Krakowski is Lisa Kudrow. No matter how hard Courtney tries to be Lisa, she will never have the uniqueness that made Lisa "Lisa." Courtney was always meant to be the George Burns to Lisa's Gracie Allen.
In short, Laura is trying way too hard and doesn't have the satirical ability that comes naturally to Jane.
In this competition, I vote Jane.
If anyone ever tells you that you put too much Parmesan cheese on your pasta, stop talking to them. You don't need that kind of negativity in your life.